I would look for an over-the-ear (circumaural) design with, if available, both wired and wireless support.

So far, I like the Sennheiser PXC 450... expect for it's price! Indeed, it still plays sounds without batteries while the Bose does not play anything anymore when it's out of juice. But the Bose QuietComfort 25, which is ~60€ cheaper (looking for best prices for both: 239€ vs 299€), has a better noise filtering technology... The choice will be very difficult...